The light coming down is in wavelengths that get through, the radiation on the way back is lower frequencies, infrared that CO2 intercepts. The sun is a massive

The light coming down is in wavelengths that get through, the radiation on the way back is lower frequencies, infrared that CO2 intercepts. The sun is a massive fusion reactor there is a lot of energy coming. The effect is small, but compounds and CO2 is an oxide, very stable molecule that sticks around.